Method of reenforcing insoles



June 5, 1934.

T. A. CALNAN 1,962,053

,METHOD OF REENFORCING INSOLES Filed June 15, 1952 if I Patented June 5,193 4 PATENT. OFFICE 1,962,053 METHOD OF REENFORCING INSOLES Thomas A.Calnan, 'Montmorency, France, as-

signor to Boston Blacking & Chemical 002, a. corporation ofMassachusetts Application June 15, 1932, Serial No. 617,466

Objects of my invention are to provide a meth-.,

0d of reenforcing insoles with textile fabric such as duck by'which itis practicable to eliminate the application of a coat of. adhesive tothe face of the duck prior to the coating which is applied by the shoemanufacturer, and to prevent, in a simple and inexpensive manner,ravelling of the cut edges of strips of uncoated textile fabric whichmay be used in said insole reenforcing method.

With the above and other objects in view the invention will now bedescribed with' reference to the accompanying drawing and pointed out inthe claims.

In the drawing, r v

Fig. 1 illustrates the application by spraying of discrete particles ofa suitable adhesive on to an end surfaceof a roll of duck;

Fig. 2 illustrates the applying or a coating of adhesive to a strip ofduck the edges of which have been prevented from ravelling in the mannerillustrated in Fig. 1, and also illustrating the applyingoi the strip toan insole and the severing from the strip of a portion of sufficientlength to reenforce the insole;

Fig. 3 illustrates the forming of the cut-off portion of the materialagainst the. inner face of the rib of the insole and against the bottomoi the insole by means of a hand tool; and

Fig. 4 illustrates the operation of further forming the reenforcingmaterial to the insole and trimming oil the excess of the reenforcingmaterial flush with the outer edge of the rib' of the insole by theoperating instrumentalities of an insole reenforcing machine. L

The roll 10 in Fig. 1 comprises, a continuous strip 12 of uncoated duckcut from relatively wide webbing as disclosed in Ellis Patent No.1,830,428, to a width suitable to the reenforcement of an insole, asindicated in Fig. 3, and of such length as to provide a roll ofconvenient size, say a foot, more or less, in diameter. Separate,discrete particles of adhesive, illustrated at 14 in Fig. 1, areappliedto the ends of the roll and distributed substantially uniformlythereover, as by means of a spray gun of well-known character,illustrated at 16 in Fig. 1; whereby the edge or marginal threads areadhesively bonded to the body of the fabric. While various types ofadhesive may be used for this purpose I prefer to use a suitablyprotected water dispersed rubber cement or latex,.compounded either fromthe natural latex of a rubber tree such as the Heo'ea brasz'liensz's orfrom an artificial water dis- 60. persion of previously coagulatedrubber, both of which are to be considered as within the meaning of theword latex as used herein. An ex. ample of such a protected latexadhesive may be made by mixing 9 parts by volume of a 35 65. degreesBeaum sodium silicate solution, 9 parts of protected latex, compoundedas hereinafter described, and 2 parts of water, thereby providing asolution which can be sprayed readily and of such a nature that thenon-coalescing, dis- 7,0. crete particles of adhesive .on the ends ofthe roll will adhere firmly, sinking into thematerial sufiiciently tobond the edge or marginal threads to the body of the-fabric-withoutbonding together I the edge threads of successive fabric layers, therebypreventing ravelling without, however, producing any considerableresistance to the unwinding of the roll or requiring excessive effort onthe part of the operator who pulls the material manually through thecoating apparatus in the shoe factory. Such anadhesive, moreover, islonglived and will not deteriorate even if the material is stored for anabnormally long time.

, The protected latex referred to above may be made up from thefollowing ingredients: 85.. Oil of camphor .5 liters Oil of citronella.1 liters Benzol 1.5 liters Ammonium sulphoricinate 1.5 Item Nekal orneomerpin 200. grams Latex (60% rubber content) l 20. liters This iscompounded by adding the oil of camphor and oil of citronella to thebenzol. This mixture is then added to the ammonium sul phoricinate(sulphonated castor oil neutral'zed with ammonia). The NekalorNeomerpin(a wellknown emulsifier comprising the disulphonic acid salt of hexalinewhich is a sulphonated product of hydrogenated naphthalene or phenol) isdissolved in about 2 l ters of hot water to which is added cold water tomake up to about 6 liters which is then added to the mixture of oil ofcamphor, oil of citronella, benzol and ammonium sulphoricinate. Whenthese two solu le tions have been well mixed they should be added to thelatex, stirring slowly but thoroughly.

In this composition theprincipal adhesive value is obtained from therubber of the latex, the

sodium silicate serving both as an adhesive and.

to protect the latex. The .oil of camphor and oil of citronellaimprovethe flow of the material and thereby help it to spray well. Thebenzol softens the rubber causing it to swell and helps the adhesive todry quickly. If preferred toluol may be used in place of benzol.Ammonium sulphoricinate softens the rubber and increases itsadhesiveness. The Nekal or Neomerpin acts as an emulsifier and togetherwith the sodium silicate enables the adhesive to be stored for areasonable time before it is sprayed.

Another variety of protected latex which may be used for this operationis one the rubber particles of which are protected with acasein-formaldehyde condensation product adsorbed on the surface of theparticles, the adhesive containing only a small proportion of the caseinformaldehyde condensation product as compared to the rubber. Such anadhesive, diluted sufiiciently to be readily sprayable, will be foundeffective for the present purposes. 7

The uncoated fabric the cut edges of which are prevented from ravellingby this treatment may be handled and appliedto the insoles in the mannerdisclosed in the Ellis Patent No. 1,830,428, except that the coating ofadhesive, whch preferably contains a substantial proportion of rubber,and which is applied to the fabric immediately before it is applied tothe insole, can advantageously be somewhat thicker.

The treated rolls of slitted duck wherein the marginal threads areadhesively bonded to the body of the otherwise uncoated fabric arepurchased by the shoe manufacturer who passes the strip progressivelythrough a sutable coating apparatus, illustrated at 18 in Fig. 2,wherein the strip of fabric is closely engaged by cooperating members,and adhesive, preferably containing a substantial proportion of rubber,applied to one side of the closely-engaged fabric. This apparatus may beof the character disclosed in Letters Patent of the United States No.1,771,388, granted July 22, 1930, on an application filed in the name ofRussell K. Nash, or of the character disclosed in Letters Patent of theUnited States No. 1,898,383, granted February 21, 1933, on anotherapplication filed in the name of said Nash.

In the operation of both of the above-mentioned the manner hereinabovedescribed, is laid out on.

a bench or table 20 (Fig. 2) and a suitably prepared insole 22 isapplied to the coated end'of the strip. As illustrated, the insole'isprovided with a lip or rib 21. This lip and the shank and forepart ofthe insole are to be reenforced but the heel seat portion 24 is to beleft bare. After the insole has been applied to the end of the strip thedesired portion of the strip is severed, as indicated at 26.' The insoleisthen turned over and the severed portion 28 (Fig. 3) is formed to thelip 21 of the insole by boning down with a hand tool 30. Then thematerial is further formed to the lip of the insole and the surpluswhich extends beyond the lip of the insole trimmed oil, for example withthe aid of an insole reenforcing machine such as that disclosed inLetters Patent of the United States No. 1,726,800, granted September 3,1929 on an application filed in the name of Frederic E. Bertrand. Suchmachine forming and trimming of the material is illustrated in Fig. 4 inwhich the marginal portion of the insole is'held between driven rolls 32and 34 while the reenforcing material is tucked in the angle between therib and the bottom of the insole by a driven roll 36. The portion of thereenforcing material which extends beyond the outer edge of the lip istrimmed off by a rapidly rotating disk knife 38. g

Certain of the advantages of my invention as compared with prior artpractices will now be apparent. Prior to my invention, when a strip ofuncoated fabrc having cut edges was drawn through an adhesive-applyingdevice wherein the fabric is closely engaged by cooperating and lateralguide members, the marginal threads loosened or ravelled. Many of theseloosened threads in fairly short lengths became separated from the bodyof 'the' fabric. Certain of these loosened threads became admixed withthe adhesive composition and were distributed over the adhesive-coatedsurface of the fabric. When such fabric was applied to the insole thesescattered threads provided undesirable ridges and to avoid this resultit was necessary to remove these threads individually from the fabricbefore application to the insole, a process time consuming andexpensive. Other loosened threads served to clog the adhesive-applyingmachine, rendering difficult the application of adhesive inpredetermined uniform quantity and necessitating frequent dismantlingand cleaning of the adhesiveapplying device. ,By my invention, on theother hand. wherein the marginal portions of the uncoated fabric areadhesively bonded to the body of the fabric, such loosening of the edgethreads is minimized or substantially prevented, wh le the necessity ofpre-coating the fabric is obviated.

Furthermore, according to another feature of the invention, wherein theedge or marginal threads of aroll of fabric are bondedto the body of thefabric by separate, discrete particles of adhesive, ravelling isprevented or minimized when the roll is unwound, partly by reason of thefact that the threads of successive superimposed layers of fabric arenot bonded together, as occurs when a continuous layer of adhesive isapplied to the sides of a roll with the accompanying result ofincreased, rather than decreased, ravelling upon unwinding the fabric.Having thus described my invention what I claim as new and desire tosecure Patent of the United States is:

1. That improvement in methods of reenforcing insoles which comprisesproviding a continuous strip of uncoated duck having cut edges andhaving. its marginal threads adhesively bonded to the body of saidduck,drawng. said duck progressively between members closely engagingthe strip of duck over substantially its entire width and applying.adhesive to the 'closelyengaged duck and afiixing the adhesive-coatedduck to insoles. p

2.- That improvement in methods of reenforcing insoles which comprisesproviding .a continuous strip of uncoated duck having cut edges andhaving, its marginal threads adhesively bonded to the body of said duck,drawing said duck progressively between lateral guide memberscooperating with the marginal portions of the duck and applying adhesiveto the laterally-guided THOMAS A. CALNAN.

by Letters

